【摘要】：深基坑環(huán)梁支撐支護結(jié)構(gòu)是近年來基坑工程中出現(xiàn)的一種新型支護形式,相比于其他支護形式,環(huán)梁支護結(jié)構(gòu)具有安全、經(jīng)濟、便于拆除等優(yōu)點。近年來我國對環(huán)梁支撐結(jié)構(gòu)形式的研究和應(yīng)用有了很大的進展,但仍存在諸多不足,在一定程度上限制了該結(jié)構(gòu)的廣泛應(yīng)用。本文在總結(jié)深基坑環(huán)梁內(nèi)支撐支護結(jié)構(gòu)體系研究現(xiàn)狀的基礎(chǔ)上,結(jié)合鎮(zhèn)江地區(qū)黃浦置業(yè)基坑工程實例對環(huán)梁支撐體系的布置形式、不同挖土工況下支護結(jié)構(gòu)的受力變形以及環(huán)梁拆撐方案開展系統(tǒng)研究。主要研究內(nèi)容包括以下幾個方面:(1)闡述深基坑環(huán)梁內(nèi)支撐支護結(jié)構(gòu)的研究現(xiàn)狀,介紹環(huán)梁支撐結(jié)構(gòu)的特點、構(gòu)造以及平面布置形式。(2)闡明環(huán)梁支撐優(yōu)化設(shè)計的目的及意義,依托基坑工程實例,利用有限元軟件BSC對環(huán)梁支撐結(jié)構(gòu)體系建立不同內(nèi)支撐結(jié)構(gòu)模型,通過對比分析有限元計算結(jié)果,按照變形最小的原則,確定最佳布撐方案,總結(jié)深基坑環(huán)梁支撐選型和計算的基本方法。(3)采用數(shù)值模擬軟件MIDAS-GTS建立基坑三維空間有限元模型,針對分層均勻挖土、分塊挖土兩種開挖模式進行模擬分析,結(jié)果表明采用分層均勻挖土施工,可以有效降低圍護結(jié)構(gòu)的變形,土方不均衡開挖會導(dǎo)致基坑處于非對稱受力狀態(tài),使支撐體系受力不均勻,變形增大,威脅基坑安全。最終確定采用分層均勻挖土方案。(4)針對環(huán)梁支撐體系主要構(gòu)件環(huán)梁、輻射桿、連系梁設(shè)定不同的拆撐順序,采用MIDAS-GTS建模計算不同順序下支撐結(jié)構(gòu)的變形,計算結(jié)果表明先拆連系桿,然后拆輻射桿,最后拆環(huán)梁的情況下變形最小,且拆撐遵循對稱拆撐原則。另外,對三種常用的拆撐施工工藝進行對比分析,確定采用混凝土靜音切割拆撐方案�，F(xiàn)場監(jiān)測結(jié)果表明,終選拆撐順序及拆撐工藝能滿足工程要求,可供今后類似工程參考。
[Abstract]:The ring beam bracing structure of deep foundation pit is a new type of supporting form in foundation pit engineering in recent years. Compared with other supporting forms, the ring beam supporting structure has the advantages of safety, economy and easy to remove. In recent years, great progress has been made in the research and application of ring beam bracing structure in China, but there are still many shortcomings, which limits the wide application of the structure to some extent. On the basis of summing up the present situation of the research on the bracing structure system of the ring beam in deep foundation pit, the layout of the bracing system of the ring beam is discussed in combination with the example of the foundation pit of Huangpu property in Zhenjiang area. The mechanical deformation of supporting structure and the supporting scheme of ring beam under different excavation conditions were studied systematically. The main research contents include the following aspects: (1) the present research situation of the bracing structure of ring beam in deep foundation pit is described, and the characteristics, structure and layout of the bracing structure of ring beam are introduced. (2) the purpose and significance of optimum design of ring beam bracing are expounded. Based on the example of foundation pit engineering, using the finite element software BSC to establish different internal bracing structure models for ring beam bracing structure system, by comparing and analyzing the results of finite element calculation, according to the principle of minimum deformation, the best bracing scheme is determined. The basic methods for selection and calculation of ring beam braces in deep foundation pit are summarized. (3) Three-dimensional finite element model of foundation pit is established by using MIDAS-GTS software. The results show that the layered and uniform excavation can effectively reduce the deformation of the retaining structure, and the uneven excavation of the earth will cause the foundation pit to be in a state of asymmetric force, which will make the bracing system unevenly loaded, the deformation increase, and threaten the safety of the foundation pit. Finally, the layered uniform excavation scheme is adopted. (4) for the main components of ring beam support system, ring beam, radiation rod and connecting beam are set up in different supporting order, and MIDAS-GTS model is used to calculate the deformation of bracing structure in different order. The calculation results show that the tie bar is removed first, then the radiation rod is removed, and the deformation is minimized when the ring beam is finally removed, and the support removal follows the principle of symmetrical bracing. In addition, by comparing and analyzing the three common construction techniques, the concrete silent cutting and bracing scheme is determined. The results of field monitoring show that the order and process of final selection and removal of bracing can meet the engineering requirements and can be used as reference for similar projects in the future.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753

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